Inversion of long period regional body waves for crustal structure

Details Inversion of long period regional body waves for crustal structure Inversion of long period regional body waves for crustal structure

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..749w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, Aug. 1986, p. 749-752.

Physics

4

Earth Crust, Earthquakes, Seismic Waves, Wave Propagation, Earth Planetary Structure, Green'S Functions, Least Squares Method, Propagation Velocity, United States

Scientific paper

Long-period regional distance (2-12 deg) body waves are strongly influenced by the waveguide nature of the crust. If the seismic source is known, it is possible to parameterize the waveforms in terms of gross structural properties of crustal thickness and Pn velocity. Since the regional distance waveforms are a product of interference of multiple reflected and mode converted phases, changes in crustal thickness or Pn velocity changes the relative timing of the various phases. The approximate Green function for a suite of crustal structures can be constructed by stretching or squeezing the Green function of an average crustal model, which is the basis of an interative, least squares inversion procedure for crustal structure. The crustal structure of the western U.S. is inverted as a test of the technique.

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